21470922 has 24 divisors (see below), whose sum is σ = 50749920. Its totient is φ = 6506280.

The previous prime is 21470909. The next prime is 21470923. The reversal of 21470922 is 22907412.

It is a super-2 number, since 2×21470922² = 922000983060168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21470923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54022 + ... + 54417.

It is an arithmetic number, because the mean of its divisors is an integer number (2114580).

Almost surely, 2^21470922 is an apocalyptic number.

21470922 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21470922 is an abundant number, since it is smaller than the sum of its proper divisors (29278998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21470922 is a wasteful number, since it uses less digits than its factorization.

21470922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108458 (or 108455 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21470922 is about 4633.6726254668. The cubic root of 21470922 is about 277.9394740824.

The spelling of 21470922 in words is "twenty-one million, four hundred seventy thousand, nine hundred twenty-two".